/* * Copyright (C) 2005-2017 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef _LIBS_LOG_LOG_MAIN_H #define _LIBS_LOG_LOG_MAIN_H #include #include __BEGIN_DECLS /* * Normally we strip the effects of ALOGV (VERBOSE messages), * LOG_FATAL and LOG_FATAL_IF (FATAL assert messages) from the * release builds be defining NDEBUG. You can modify this (for * example with "#define LOG_NDEBUG 0" at the top of your source * file) to change that behavior. */ #ifndef LOG_NDEBUG #ifdef NDEBUG #define LOG_NDEBUG 1 #else #define LOG_NDEBUG 0 #endif #endif /* --------------------------------------------------------------------- */ /* * This file uses ", ## __VA_ARGS__" zero-argument token pasting to * work around issues with debug-only syntax errors in assertions * that are missing format strings. See commit * 19299904343daf191267564fe32e6cd5c165cd42 */ #if defined(__clang__) #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments" #endif #ifndef __predict_false #define __predict_false(exp) __builtin_expect((exp) != 0, 0) #endif #define android_writeLog(prio, tag, text) __android_log_write(prio, tag, text) #define android_printLog(prio, tag, ...) \ __android_log_print(prio, tag, __VA_ARGS__) #define android_vprintLog(prio, cond, tag, ...) \ __android_log_vprint(prio, tag, __VA_ARGS__) /* * Log macro that allows you to specify a number for the priority. */ #ifndef LOG_PRI #define LOG_PRI(priority, tag, ...) android_printLog(priority, tag, __VA_ARGS__) #endif /* * Log macro that allows you to pass in a varargs ("args" is a va_list). */ #ifndef LOG_PRI_VA #define LOG_PRI_VA(priority, tag, fmt, args) \ android_vprintLog(priority, NULL, tag, fmt, args) #endif /* --------------------------------------------------------------------- */ /* XXX Macros to work around syntax errors in places where format string * arg is not passed to ALOG_ASSERT, LOG_ALWAYS_FATAL or LOG_ALWAYS_FATAL_IF * (happens only in debug builds). */ /* Returns 2nd arg. Used to substitute default value if caller's vararg list * is empty. */ #define __android_second(dummy, second, ...) second /* If passed multiple args, returns ',' followed by all but 1st arg, otherwise * returns nothing. */ #define __android_rest(first, ...) , ##__VA_ARGS__ #define android_printAssert(cond, tag, ...) \ __android_log_assert(cond, tag, \ __android_second(0, ##__VA_ARGS__, NULL) \ __android_rest(__VA_ARGS__)) /* * Log a fatal error. If the given condition fails, this stops program * execution like a normal assertion, but also generating the given message. * It is NOT stripped from release builds. Note that the condition test * is -inverted- from the normal assert() semantics. */ #ifndef LOG_ALWAYS_FATAL_IF #define LOG_ALWAYS_FATAL_IF(cond, ...) \ ((__predict_false(cond)) \ ? ((void)android_printAssert(#cond, LOG_TAG, ##__VA_ARGS__)) \ : (void)0) #endif #ifndef LOG_ALWAYS_FATAL #define LOG_ALWAYS_FATAL(...) \ (((void)android_printAssert(NULL, LOG_TAG, ##__VA_ARGS__))) #endif /* * Versions of LOG_ALWAYS_FATAL_IF and LOG_ALWAYS_FATAL that * are stripped out of release builds. */ #if LOG_NDEBUG #ifndef LOG_FATAL_IF #define LOG_FATAL_IF(cond, ...) ((void)0) #endif #ifndef LOG_FATAL #define LOG_FATAL(...) ((void)0) #endif #else #ifndef LOG_FATAL_IF #define LOG_FATAL_IF(cond, ...) LOG_ALWAYS_FATAL_IF(cond, ##__VA_ARGS__) #endif #ifndef LOG_FATAL #define LOG_FATAL(...) LOG_ALWAYS_FATAL(__VA_ARGS__) #endif #endif /* * Assertion that generates a log message when the assertion fails. * Stripped out of release builds. Uses the current LOG_TAG. */ #ifndef ALOG_ASSERT #define ALOG_ASSERT(cond, ...) LOG_FATAL_IF(!(cond), ##__VA_ARGS__) #endif /* --------------------------------------------------------------------- */ /* * C/C++ logging functions. See the logging documentation for API details. * * We'd like these to be available from C code (in case we import some from * somewhere), so this has a C interface. * * The output will be correct when the log file is shared between multiple * threads and/or multiple processes so long as the operating system * supports O_APPEND. These calls have mutex-protected data structures * and so are NOT reentrant. Do not use LOG in a signal handler. */ /* --------------------------------------------------------------------- */ /* * Simplified macro to send a verbose log message using the current LOG_TAG. */ #ifndef ALOGV #define __ALOGV(...) ((void)ALOG(LOG_VERBOSE, LOG_TAG, __VA_ARGS__)) #if LOG_NDEBUG #define ALOGV(...) \ do { \ if (0) { \ __ALOGV(__VA_ARGS__); \ } \ } while (0) #else #define ALOGV(...) __ALOGV(__VA_ARGS__) #endif #endif #ifndef ALOGV_IF #if LOG_NDEBUG #define ALOGV_IF(cond, ...) ((void)0) #else #define ALOGV_IF(cond, ...) \ ((__predict_false(cond)) ? ((void)ALOG(LOG_VERBOSE, LOG_TAG, __VA_ARGS__)) \ : (void)0) #endif #endif /* * Simplified macro to send a debug log message using the current LOG_TAG. */ #ifndef ALOGD #define ALOGD(...) ((void)ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__)) #endif #ifndef ALOGD_IF #define ALOGD_IF(cond, ...) \ ((__predict_false(cond)) ? ((void)ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__)) \ : (void)0) #endif /* * Simplified macro to send an info log message using the current LOG_TAG. */ #ifndef ALOGI #define ALOGI(...) ((void)ALOG(LOG_INFO, LOG_TAG, __VA_ARGS__)) #endif #ifndef ALOGI_IF #define ALOGI_IF(cond, ...) \ ((__predict_false(cond)) ? ((void)ALOG(LOG_INFO, LOG_TAG, __VA_ARGS__)) \ : (void)0) #endif /* * Simplified macro to send a warning log message using the current LOG_TAG. */ #ifndef ALOGW #define ALOGW(...) ((void)ALOG(LOG_WARN, LOG_TAG, __VA_ARGS__)) #endif #ifndef ALOGW_IF #define ALOGW_IF(cond, ...) \ ((__predict_false(cond)) ? ((void)ALOG(LOG_WARN, LOG_TAG, __VA_ARGS__)) \ : (void)0) #endif /* * Simplified macro to send an error log message using the current LOG_TAG. */ #ifndef ALOGE #define ALOGE(...) ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__)) #endif #ifndef ALOGE_IF #define ALOGE_IF(cond, ...) \ ((__predict_false(cond)) ? ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__)) \ : (void)0) #endif /* --------------------------------------------------------------------- */ /* * Conditional based on whether the current LOG_TAG is enabled at * verbose priority. */ #ifndef IF_ALOGV #if LOG_NDEBUG #define IF_ALOGV() if (false) #else #define IF_ALOGV() IF_ALOG(LOG_VERBOSE, LOG_TAG) #endif #endif /* * Conditional based on whether the current LOG_TAG is enabled at * debug priority. */ #ifndef IF_ALOGD #define IF_ALOGD() IF_ALOG(LOG_DEBUG, LOG_TAG) #endif /* * Conditional based on whether the current LOG_TAG is enabled at * info priority. */ #ifndef IF_ALOGI #define IF_ALOGI() IF_ALOG(LOG_INFO, LOG_TAG) #endif /* * Conditional based on whether the current LOG_TAG is enabled at * warn priority. */ #ifndef IF_ALOGW #define IF_ALOGW() IF_ALOG(LOG_WARN, LOG_TAG) #endif /* * Conditional based on whether the current LOG_TAG is enabled at * error priority. */ #ifndef IF_ALOGE #define IF_ALOGE() IF_ALOG(LOG_ERROR, LOG_TAG) #endif /* --------------------------------------------------------------------- */ /* * Basic log message macro. * * Example: * ALOG(LOG_WARN, NULL, "Failed with error %d", errno); * * The second argument may be NULL or "" to indicate the "global" tag. */ #ifndef ALOG #define ALOG(priority, tag, ...) LOG_PRI(ANDROID_##priority, tag, __VA_ARGS__) #endif /* * Conditional given a desired logging priority and tag. */ #ifndef IF_ALOG #define IF_ALOG(priority, tag) if (android_testLog(ANDROID_##priority, tag)) #endif /* --------------------------------------------------------------------- */ /* * IF_ALOG uses android_testLog, but IF_ALOG can be overridden. * android_testLog will remain constant in its purpose as a wrapper * for Android logging filter policy, and can be subject to * change. It can be reused by the developers that override * IF_ALOG as a convenient means to reimplement their policy * over Android. */ #ifndef __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE #ifndef __ANDROID_API__ #define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 2 #elif __ANDROID_API__ > 24 /* > Nougat */ #define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 2 #elif __ANDROID_API__ > 22 /* > Lollipop */ #define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 1 #else #define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 0 #endif #endif #if __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE /* * Use the per-tag properties "log.tag." to generate a runtime * result of non-zero to expose a log. prio is ANDROID_LOG_VERBOSE to * ANDROID_LOG_FATAL. default_prio if no property. Undefined behavior if * any other value. */ int __android_log_is_loggable(int prio, const char* tag, int default_prio); #if __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE > 1 #include int __android_log_is_loggable_len(int prio, const char* tag, size_t len, int default_prio); #if LOG_NDEBUG /* Production */ #define android_testLog(prio, tag) \ (__android_log_is_loggable_len(prio, tag, ((tag) && *(tag)) ? strlen(tag) : 0, \ ANDROID_LOG_DEBUG) != 0) #else #define android_testLog(prio, tag) \ (__android_log_is_loggable_len(prio, tag, ((tag) && *(tag)) ? strlen(tag) : 0, \ ANDROID_LOG_VERBOSE) != 0) #endif #else #if LOG_NDEBUG /* Production */ #define android_testLog(prio, tag) \ (__android_log_is_loggable(prio, tag, ANDROID_LOG_DEBUG) != 0) #else #define android_testLog(prio, tag) \ (__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE) != 0) #endif #endif #else /* __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE */ #define android_testLog(prio, tag) (1) #endif /* !__ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE */ #if defined(__clang__) #pragma clang diagnostic pop #endif __END_DECLS #endif /* _LIBS_LOG_LOG_MAIN_H */